Require sRGB write control for sRGB support. Add flag to GrPaint to suppress linear -> sRGB convers…

src/gpu/GrPaint.cpp

 
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrPaint.h"
 
 #include "GrProcOptInfo.h"
 #include "effects/GrCoverageSetOpXP.h"
 #include "effects/GrPorterDuffXferProcessor.h"
 #include "effects/GrSimpleTextureEffect.h"
 
 GrPaint::GrPaint()
     : fAntiAlias(false)
+    , fDisableOutputConversionToSRGB(false)
     , fColor(GrColor_WHITE) {}
 
 void GrPaint::setCoverageSetOpXPFactory(SkRegion::Op regionOp, bool invertCoverage) {
     fXPFactory.reset(GrCoverageSetOpXPFactory::Create(regionOp, invertCoverage));
 }
 
 void GrPaint::addColorTextureProcessor(GrTexture* texture, const SkMatrix& matrix) {
     this->addColorFragmentProcessor(GrSimpleTextureEffect::Create(texture, matrix))->unref();
 }
 
@@ skipping 30 matching lines @@
                                                             colorProcInfo.isOpaque(),
                                                             &blendedColor); 
     }
 
     if (kRGBA_GrColorComponentFlags == blendedColor.fKnownColorFlags) {
         *color = blendedColor.fKnownColor;
         return true;
     }
     return false;
 }